Re: [tcpm] WGLC comments addressed in draft-ietf-tcpm-converters-09?

<philip.eardley@bt.com> Wed, 18 September 2019 16:12 UTC

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From: <philip.eardley@bt.com>
To: <mohamed.boucadair@orange.com>, <Michael.Scharf@hs-esslingen.de>, <tcpm@ietf.org>
CC: <tcpm-chairs@ietf.org>
Thread-Topic: WGLC comments addressed in draft-ietf-tcpm-converters-09?
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Date: Wed, 18 Sep 2019 16:12:19 +0000
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Subject: Re: [tcpm] WGLC comments addressed in draft-ietf-tcpm-converters-09?
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A specific point

-----Original Message-----

> 
> Note that the use of a Transport Converter means that there is no 
> end-to- end transport connection between the Client and Server.

[Med] Will add this. 

 This could
> potentially create problems in some scenarios, for example a failure 
> mode of the Converter where data was correctly received by the 
> converter from the client, but then it failed to forward the data on to the server.

>[Med] This is not an issue for the Converter because it can inform the client by means of Network Failure (65) or Destination Unreachable (97). The Client can react to this error. This is not possible with PEPs.

[phil] It would be good to point this out. 
But note this doesn't work if the Converter can't send these msgs. The point is that the potential failure modes are slightly different for the Converter case vs the e2e transport connection.